Wastewater Purifiers

In recent years, contamination of the rivers and the soil by livestock wastewater has been getting worse in the rural areas of Japan.
The wastewater is also causing groundwater pollution in the same areas due to nitrate nitrogen and organic phosphorous compounds. Based on the fundamental philosophy of ACT, we have developed wastewater treatment systems to resolve the environmental issue. We believe that by providing water purifiers at reasonable costs using our advanced technology, we would make a valuable contribution to building a sustainable society.

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Features of the wastewater purifiers

1. They preserve agricultural or industrial fatty wastewater from decay and prevent a generation of malodor.
2. They achieve high-efficiency water purification by microorganisms utilizing activated coal*1.
3. They need no chemical substance such as ozone.
4. The ACT system*2 emulsifies and disperses fat aggregations such as milk fat globule. It accelerates the purification process and enables miniaturization and simplification of the whole system.
5. Smaller systems cost less than larger ones.

*1: Specially treated microorganism-carrying coal
*2: Special filtering equipment to process aggregated fat

Schematic views of the wastewater purifiers

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Examples of wastewater purification

A vegetable processing factory

Substance: phosphorous
Result: phosphorous decreased from 6.14ppm to 0.01ppm in 24 hours

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A plating factory

Subtance: rustproof oil, surfactant
Result: suspended solid decreased from 34ppm to 15ppm, n-Hex*3 from 18ppm to less than 5ppm

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A body shop

Substance: mineral oil etc.
Result: BOD decreased from 69.1ppm to 12.8ppm, n-Hex from 42ppm to undetectable

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A vegetable processing factory

Substance: phosphorous
Result: suspended solid decreased from 1,300ppm to 16ppm, BOD from 240 ppm to 120ppm, n-Hex from 30ppm to 3.5 ppm

*3: normal hexane extraction substance

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Treatment of parlor wastewater

In the general remarks, treatment of wastewater containing much fat is difficult. Butterfat in parlor wastewater makes the treatment especially hard, and they had to build large and expensive treatment facilities or gave up the treatment before we developed new processing technology. Milk fat is hard to process because it forms small globules. The globules coagulate into large aggregates that tend to float on the water and cause various problems in the water treatment system.

For these ten years ACT has been holding shared researches with institutes such as AIST*4, and has utilized the activated coal and the ACT systems for our wastewater purifiers. Thus, ACT has developed the first activated sludge method for parlor wastewater treatment using no chemicals.

*4: National Institute of Advanced Industrial Science and Technology

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Purification test of water containing milk

We put the activated coal in water with 20vol% of milk, aerated the water with air for 23 hours, and eliminated 98.5% of fat(measured as n-Hex).

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Chemical composition of the milk used in the test

nonfat solid	8.5%
protein	3.3%
carbohydrate	4.8%
butterfat	3.7%
BOD	174,000mg/L

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Before and after the test

	before	after	removing efficiency
n-Hex	840mg/L	13mg/L	98.5%
BOD	34,800mg/L	6,260mg/L	82.0%

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Pilot plant tests of the parlor wastewater treatment system at Obihiro

We made a pilot plant at Obihiro University of Agriculture and Veterinary Medicine and conducted verification tests of its purification performance. Some of the results are as follows:

We put water that contained 26.7% of waste milk in the system, and the BOD of the treated water decreased to 50mg/L. This value is significantly lower than the BOD regulation value in Japanese water effluent standards (120mg/L).

During the winter season, temperatures of the parlor wastewater decreased as low as 3.5 degrees centigrade, yet the COD of the treated water was less than 20mg/L throughout the season. Thus the effectiveness of the system in cold districts such as Hokkaido has been proved.

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Examples of purification data in the coldest season

Sampling date: January 29, 2009

Items	raw water	treated water
BOC(mg/L)	5,800	15
COD(mg/L)	3,100	35
suspended solid(mg/L)	2,200	11
n-Hex(mg/L)	1,600	1
nitrogen(mg/L)	270	3
phosphorus(mg/L)	41	2

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Sampling date: March 16, 2010

Items	raw water	treated water
BOC(mg/L)	4,600	4.4
COD(mg/L)	3,100	14
suspended solid(mg/L)	2,800	4
n-Hex(mg/L)	240	1.4
nitrogen(mg/L)	340	9.8
phosphorus(mg/L)	80	22

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Examples of our water purifiers are as follows:

Capacity:16.5cbm/day Building area: 107.35sq.m
Capacity: 3cbm/day Building area: 103.8sq.m
Capacity: 5cbm/day Building area: 48.3sq.m
Capacity: 25cbm/day Building area: 218.1sq.m
Capacity: 6cbm/day Building area: 46.2sq.m
Capacity: 6cbm/day Building area: 46.6sq.m